Commit | Line | Data |
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bcea3f96 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f3f096cf SD |
2 | /* |
3 | * uprobes-based tracing events | |
4 | * | |
f3f096cf SD |
5 | * Copyright (C) IBM Corporation, 2010-2012 |
6 | * Author: Srikar Dronamraju <srikar@linux.vnet.ibm.com> | |
7 | */ | |
ea6eb5e7 | 8 | #define pr_fmt(fmt) "trace_uprobe: " fmt |
f3f096cf | 9 | |
17911ff3 | 10 | #include <linux/security.h> |
0597c49c | 11 | #include <linux/ctype.h> |
f3f096cf SD |
12 | #include <linux/module.h> |
13 | #include <linux/uaccess.h> | |
14 | #include <linux/uprobes.h> | |
15 | #include <linux/namei.h> | |
b2e902f0 | 16 | #include <linux/string.h> |
b2d09103 | 17 | #include <linux/rculist.h> |
f3f096cf | 18 | |
0597c49c | 19 | #include "trace_dynevent.h" |
f3f096cf | 20 | #include "trace_probe.h" |
53305928 | 21 | #include "trace_probe_tmpl.h" |
f3f096cf SD |
22 | |
23 | #define UPROBE_EVENT_SYSTEM "uprobes" | |
24 | ||
457d1772 ON |
25 | struct uprobe_trace_entry_head { |
26 | struct trace_entry ent; | |
27 | unsigned long vaddr[]; | |
28 | }; | |
29 | ||
30 | #define SIZEOF_TRACE_ENTRY(is_return) \ | |
31 | (sizeof(struct uprobe_trace_entry_head) + \ | |
32 | sizeof(unsigned long) * (is_return ? 2 : 1)) | |
33 | ||
34 | #define DATAOF_TRACE_ENTRY(entry, is_return) \ | |
35 | ((void*)(entry) + SIZEOF_TRACE_ENTRY(is_return)) | |
36 | ||
736288ba ON |
37 | struct trace_uprobe_filter { |
38 | rwlock_t rwlock; | |
39 | int nr_systemwide; | |
40 | struct list_head perf_events; | |
41 | }; | |
42 | ||
0597c49c MH |
43 | static int trace_uprobe_create(int argc, const char **argv); |
44 | static int trace_uprobe_show(struct seq_file *m, struct dyn_event *ev); | |
45 | static int trace_uprobe_release(struct dyn_event *ev); | |
46 | static bool trace_uprobe_is_busy(struct dyn_event *ev); | |
47 | static bool trace_uprobe_match(const char *system, const char *event, | |
30199137 | 48 | int argc, const char **argv, struct dyn_event *ev); |
0597c49c MH |
49 | |
50 | static struct dyn_event_operations trace_uprobe_ops = { | |
51 | .create = trace_uprobe_create, | |
52 | .show = trace_uprobe_show, | |
53 | .is_busy = trace_uprobe_is_busy, | |
54 | .free = trace_uprobe_release, | |
55 | .match = trace_uprobe_match, | |
56 | }; | |
57 | ||
f3f096cf SD |
58 | /* |
59 | * uprobe event core functions | |
60 | */ | |
f3f096cf | 61 | struct trace_uprobe { |
0597c49c | 62 | struct dyn_event devent; |
736288ba | 63 | struct trace_uprobe_filter filter; |
a932b738 | 64 | struct uprobe_consumer consumer; |
0c92c7a3 | 65 | struct path path; |
f3f096cf SD |
66 | struct inode *inode; |
67 | char *filename; | |
68 | unsigned long offset; | |
1cc33161 | 69 | unsigned long ref_ctr_offset; |
f3f096cf | 70 | unsigned long nhit; |
14577c39 | 71 | struct trace_probe tp; |
f3f096cf SD |
72 | }; |
73 | ||
0597c49c MH |
74 | static bool is_trace_uprobe(struct dyn_event *ev) |
75 | { | |
76 | return ev->ops == &trace_uprobe_ops; | |
77 | } | |
78 | ||
79 | static struct trace_uprobe *to_trace_uprobe(struct dyn_event *ev) | |
80 | { | |
81 | return container_of(ev, struct trace_uprobe, devent); | |
82 | } | |
83 | ||
84 | /** | |
85 | * for_each_trace_uprobe - iterate over the trace_uprobe list | |
86 | * @pos: the struct trace_uprobe * for each entry | |
87 | * @dpos: the struct dyn_event * to use as a loop cursor | |
88 | */ | |
89 | #define for_each_trace_uprobe(pos, dpos) \ | |
90 | for_each_dyn_event(dpos) \ | |
91 | if (is_trace_uprobe(dpos) && (pos = to_trace_uprobe(dpos))) | |
92 | ||
14577c39 NK |
93 | #define SIZEOF_TRACE_UPROBE(n) \ |
94 | (offsetof(struct trace_uprobe, tp.args) + \ | |
f3f096cf SD |
95 | (sizeof(struct probe_arg) * (n))) |
96 | ||
97 | static int register_uprobe_event(struct trace_uprobe *tu); | |
c6c2401d | 98 | static int unregister_uprobe_event(struct trace_uprobe *tu); |
f3f096cf | 99 | |
b7e0bf34 NK |
100 | struct uprobe_dispatch_data { |
101 | struct trace_uprobe *tu; | |
102 | unsigned long bp_addr; | |
103 | }; | |
104 | ||
f3f096cf | 105 | static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs); |
c1ae5c75 ON |
106 | static int uretprobe_dispatcher(struct uprobe_consumer *con, |
107 | unsigned long func, struct pt_regs *regs); | |
f3f096cf | 108 | |
3fd996a2 NK |
109 | #ifdef CONFIG_STACK_GROWSUP |
110 | static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n) | |
111 | { | |
112 | return addr - (n * sizeof(long)); | |
113 | } | |
114 | #else | |
115 | static unsigned long adjust_stack_addr(unsigned long addr, unsigned int n) | |
116 | { | |
117 | return addr + (n * sizeof(long)); | |
118 | } | |
119 | #endif | |
120 | ||
121 | static unsigned long get_user_stack_nth(struct pt_regs *regs, unsigned int n) | |
122 | { | |
123 | unsigned long ret; | |
124 | unsigned long addr = user_stack_pointer(regs); | |
125 | ||
126 | addr = adjust_stack_addr(addr, n); | |
127 | ||
128 | if (copy_from_user(&ret, (void __force __user *) addr, sizeof(ret))) | |
129 | return 0; | |
130 | ||
131 | return ret; | |
132 | } | |
133 | ||
134 | /* | |
135 | * Uprobes-specific fetch functions | |
136 | */ | |
53305928 | 137 | static nokprobe_inline int |
9b960a38 | 138 | probe_mem_read(void *dest, void *src, size_t size) |
53305928 MH |
139 | { |
140 | void __user *vaddr = (void __force __user *)src; | |
141 | ||
f3f58935 | 142 | return copy_from_user(dest, vaddr, size) ? -EFAULT : 0; |
5baaa59e | 143 | } |
e65f7ae7 MH |
144 | |
145 | static nokprobe_inline int | |
146 | probe_mem_read_user(void *dest, void *src, size_t size) | |
147 | { | |
148 | return probe_mem_read(dest, src, size); | |
149 | } | |
150 | ||
5baaa59e NK |
151 | /* |
152 | * Fetch a null-terminated string. Caller MUST set *(u32 *)dest with max | |
153 | * length and relative data location. | |
154 | */ | |
9178412d MH |
155 | static nokprobe_inline int |
156 | fetch_store_string(unsigned long addr, void *dest, void *base) | |
5baaa59e NK |
157 | { |
158 | long ret; | |
9178412d MH |
159 | u32 loc = *(u32 *)dest; |
160 | int maxlen = get_loc_len(loc); | |
161 | u8 *dst = get_loc_data(dest, base); | |
5baaa59e NK |
162 | void __user *src = (void __force __user *) addr; |
163 | ||
9178412d MH |
164 | if (unlikely(!maxlen)) |
165 | return -ENOMEM; | |
5baaa59e | 166 | |
4dd537ac MH |
167 | if (addr == FETCH_TOKEN_COMM) |
168 | ret = strlcpy(dst, current->comm, maxlen); | |
169 | else | |
170 | ret = strncpy_from_user(dst, src, maxlen); | |
9178412d MH |
171 | if (ret >= 0) { |
172 | if (ret == maxlen) | |
173 | dst[ret - 1] = '\0'; | |
0722069a AZ |
174 | else |
175 | /* | |
176 | * Include the terminating null byte. In this case it | |
177 | * was copied by strncpy_from_user but not accounted | |
178 | * for in ret. | |
179 | */ | |
180 | ret++; | |
9178412d | 181 | *(u32 *)dest = make_data_loc(ret, (void *)dst - base); |
5baaa59e | 182 | } |
9178412d MH |
183 | |
184 | return ret; | |
5baaa59e NK |
185 | } |
186 | ||
88903c46 MH |
187 | static nokprobe_inline int |
188 | fetch_store_string_user(unsigned long addr, void *dest, void *base) | |
189 | { | |
190 | return fetch_store_string(addr, dest, base); | |
191 | } | |
192 | ||
53305928 | 193 | /* Return the length of string -- including null terminal byte */ |
9178412d MH |
194 | static nokprobe_inline int |
195 | fetch_store_strlen(unsigned long addr) | |
5baaa59e NK |
196 | { |
197 | int len; | |
198 | void __user *vaddr = (void __force __user *) addr; | |
199 | ||
4dd537ac MH |
200 | if (addr == FETCH_TOKEN_COMM) |
201 | len = strlen(current->comm) + 1; | |
202 | else | |
203 | len = strnlen_user(vaddr, MAX_STRING_SIZE); | |
5baaa59e | 204 | |
9178412d | 205 | return (len > MAX_STRING_SIZE) ? 0 : len; |
5baaa59e | 206 | } |
3fd996a2 | 207 | |
88903c46 MH |
208 | static nokprobe_inline int |
209 | fetch_store_strlen_user(unsigned long addr) | |
210 | { | |
211 | return fetch_store_strlen(addr); | |
212 | } | |
213 | ||
53305928 | 214 | static unsigned long translate_user_vaddr(unsigned long file_offset) |
b7e0bf34 NK |
215 | { |
216 | unsigned long base_addr; | |
217 | struct uprobe_dispatch_data *udd; | |
218 | ||
219 | udd = (void *) current->utask->vaddr; | |
220 | ||
221 | base_addr = udd->bp_addr - udd->tu->offset; | |
53305928 | 222 | return base_addr + file_offset; |
b7e0bf34 | 223 | } |
b7e0bf34 | 224 | |
53305928 MH |
225 | /* Note that we don't verify it, since the code does not come from user space */ |
226 | static int | |
227 | process_fetch_insn(struct fetch_insn *code, struct pt_regs *regs, void *dest, | |
9178412d | 228 | void *base) |
53305928 MH |
229 | { |
230 | unsigned long val; | |
53305928 MH |
231 | |
232 | /* 1st stage: get value from context */ | |
233 | switch (code->op) { | |
234 | case FETCH_OP_REG: | |
235 | val = regs_get_register(regs, code->param); | |
236 | break; | |
237 | case FETCH_OP_STACK: | |
238 | val = get_user_stack_nth(regs, code->param); | |
239 | break; | |
240 | case FETCH_OP_STACKP: | |
241 | val = user_stack_pointer(regs); | |
242 | break; | |
243 | case FETCH_OP_RETVAL: | |
244 | val = regs_return_value(regs); | |
245 | break; | |
246 | case FETCH_OP_IMM: | |
247 | val = code->immediate; | |
248 | break; | |
4dd537ac MH |
249 | case FETCH_OP_COMM: |
250 | val = FETCH_TOKEN_COMM; | |
251 | break; | |
a42e3c4d MH |
252 | case FETCH_OP_DATA: |
253 | val = (unsigned long)code->data; | |
254 | break; | |
53305928 MH |
255 | case FETCH_OP_FOFFS: |
256 | val = translate_user_vaddr(code->immediate); | |
257 | break; | |
258 | default: | |
259 | return -EILSEQ; | |
260 | } | |
261 | code++; | |
262 | ||
9b960a38 | 263 | return process_fetch_insn_bottom(code, val, dest, base); |
53305928 MH |
264 | } |
265 | NOKPROBE_SYMBOL(process_fetch_insn) | |
266 | ||
736288ba ON |
267 | static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter) |
268 | { | |
269 | rwlock_init(&filter->rwlock); | |
270 | filter->nr_systemwide = 0; | |
271 | INIT_LIST_HEAD(&filter->perf_events); | |
272 | } | |
273 | ||
274 | static inline bool uprobe_filter_is_empty(struct trace_uprobe_filter *filter) | |
275 | { | |
276 | return !filter->nr_systemwide && list_empty(&filter->perf_events); | |
277 | } | |
278 | ||
c1ae5c75 ON |
279 | static inline bool is_ret_probe(struct trace_uprobe *tu) |
280 | { | |
281 | return tu->consumer.ret_handler != NULL; | |
282 | } | |
283 | ||
0597c49c MH |
284 | static bool trace_uprobe_is_busy(struct dyn_event *ev) |
285 | { | |
286 | struct trace_uprobe *tu = to_trace_uprobe(ev); | |
287 | ||
288 | return trace_probe_is_enabled(&tu->tp); | |
289 | } | |
290 | ||
ab10d69e MH |
291 | static bool trace_uprobe_match_command_head(struct trace_uprobe *tu, |
292 | int argc, const char **argv) | |
293 | { | |
294 | char buf[MAX_ARGSTR_LEN + 1]; | |
295 | int len; | |
296 | ||
297 | if (!argc) | |
298 | return true; | |
299 | ||
300 | len = strlen(tu->filename); | |
301 | if (strncmp(tu->filename, argv[0], len) || argv[0][len] != ':') | |
302 | return false; | |
303 | ||
304 | if (tu->ref_ctr_offset == 0) | |
305 | snprintf(buf, sizeof(buf), "0x%0*lx", | |
306 | (int)(sizeof(void *) * 2), tu->offset); | |
307 | else | |
308 | snprintf(buf, sizeof(buf), "0x%0*lx(0x%lx)", | |
309 | (int)(sizeof(void *) * 2), tu->offset, | |
310 | tu->ref_ctr_offset); | |
311 | if (strcmp(buf, &argv[0][len + 1])) | |
312 | return false; | |
313 | ||
314 | argc--; argv++; | |
315 | ||
316 | return trace_probe_match_command_args(&tu->tp, argc, argv); | |
317 | } | |
318 | ||
0597c49c | 319 | static bool trace_uprobe_match(const char *system, const char *event, |
30199137 | 320 | int argc, const char **argv, struct dyn_event *ev) |
0597c49c MH |
321 | { |
322 | struct trace_uprobe *tu = to_trace_uprobe(ev); | |
323 | ||
b55ce203 | 324 | return strcmp(trace_probe_name(&tu->tp), event) == 0 && |
ab10d69e MH |
325 | (!system || strcmp(trace_probe_group_name(&tu->tp), system) == 0) && |
326 | trace_uprobe_match_command_head(tu, argc, argv); | |
0597c49c MH |
327 | } |
328 | ||
60d53e2c MH |
329 | static nokprobe_inline struct trace_uprobe * |
330 | trace_uprobe_primary_from_call(struct trace_event_call *call) | |
331 | { | |
332 | struct trace_probe *tp; | |
333 | ||
334 | tp = trace_probe_primary_from_call(call); | |
335 | if (WARN_ON_ONCE(!tp)) | |
336 | return NULL; | |
337 | ||
338 | return container_of(tp, struct trace_uprobe, tp); | |
339 | } | |
340 | ||
f3f096cf SD |
341 | /* |
342 | * Allocate new trace_uprobe and initialize it (including uprobes). | |
343 | */ | |
344 | static struct trace_uprobe * | |
c1ae5c75 | 345 | alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret) |
f3f096cf SD |
346 | { |
347 | struct trace_uprobe *tu; | |
455b2899 | 348 | int ret; |
f3f096cf SD |
349 | |
350 | tu = kzalloc(SIZEOF_TRACE_UPROBE(nargs), GFP_KERNEL); | |
351 | if (!tu) | |
352 | return ERR_PTR(-ENOMEM); | |
353 | ||
455b2899 MH |
354 | ret = trace_probe_init(&tu->tp, event, group); |
355 | if (ret < 0) | |
f3f096cf SD |
356 | goto error; |
357 | ||
0597c49c | 358 | dyn_event_init(&tu->devent, &trace_uprobe_ops); |
a932b738 | 359 | tu->consumer.handler = uprobe_dispatcher; |
c1ae5c75 ON |
360 | if (is_ret) |
361 | tu->consumer.ret_handler = uretprobe_dispatcher; | |
736288ba | 362 | init_trace_uprobe_filter(&tu->filter); |
f3f096cf SD |
363 | return tu; |
364 | ||
365 | error: | |
f3f096cf SD |
366 | kfree(tu); |
367 | ||
455b2899 | 368 | return ERR_PTR(ret); |
f3f096cf SD |
369 | } |
370 | ||
371 | static void free_trace_uprobe(struct trace_uprobe *tu) | |
372 | { | |
0597c49c MH |
373 | if (!tu) |
374 | return; | |
375 | ||
0c92c7a3 | 376 | path_put(&tu->path); |
455b2899 | 377 | trace_probe_cleanup(&tu->tp); |
f3f096cf SD |
378 | kfree(tu->filename); |
379 | kfree(tu); | |
380 | } | |
381 | ||
382 | static struct trace_uprobe *find_probe_event(const char *event, const char *group) | |
383 | { | |
0597c49c | 384 | struct dyn_event *pos; |
f3f096cf SD |
385 | struct trace_uprobe *tu; |
386 | ||
0597c49c | 387 | for_each_trace_uprobe(tu, pos) |
b55ce203 MH |
388 | if (strcmp(trace_probe_name(&tu->tp), event) == 0 && |
389 | strcmp(trace_probe_group_name(&tu->tp), group) == 0) | |
f3f096cf SD |
390 | return tu; |
391 | ||
392 | return NULL; | |
393 | } | |
394 | ||
0597c49c | 395 | /* Unregister a trace_uprobe and probe_event */ |
c6c2401d | 396 | static int unregister_trace_uprobe(struct trace_uprobe *tu) |
f3f096cf | 397 | { |
c6c2401d SRRH |
398 | int ret; |
399 | ||
41af3cf5 MH |
400 | if (trace_probe_has_sibling(&tu->tp)) |
401 | goto unreg; | |
402 | ||
c6c2401d SRRH |
403 | ret = unregister_uprobe_event(tu); |
404 | if (ret) | |
405 | return ret; | |
406 | ||
41af3cf5 | 407 | unreg: |
0597c49c | 408 | dyn_event_remove(&tu->devent); |
41af3cf5 | 409 | trace_probe_unlink(&tu->tp); |
f3f096cf | 410 | free_trace_uprobe(tu); |
c6c2401d | 411 | return 0; |
f3f096cf SD |
412 | } |
413 | ||
fe60b0ce MH |
414 | static bool trace_uprobe_has_same_uprobe(struct trace_uprobe *orig, |
415 | struct trace_uprobe *comp) | |
416 | { | |
417 | struct trace_probe_event *tpe = orig->tp.event; | |
418 | struct trace_probe *pos; | |
419 | struct inode *comp_inode = d_real_inode(comp->path.dentry); | |
420 | int i; | |
421 | ||
422 | list_for_each_entry(pos, &tpe->probes, list) { | |
423 | orig = container_of(pos, struct trace_uprobe, tp); | |
424 | if (comp_inode != d_real_inode(orig->path.dentry) || | |
425 | comp->offset != orig->offset) | |
426 | continue; | |
427 | ||
428 | /* | |
429 | * trace_probe_compare_arg_type() ensured that nr_args and | |
430 | * each argument name and type are same. Let's compare comm. | |
431 | */ | |
432 | for (i = 0; i < orig->tp.nr_args; i++) { | |
433 | if (strcmp(orig->tp.args[i].comm, | |
434 | comp->tp.args[i].comm)) | |
f8d7ab2b | 435 | break; |
fe60b0ce MH |
436 | } |
437 | ||
f8d7ab2b SD |
438 | if (i == orig->tp.nr_args) |
439 | return true; | |
fe60b0ce MH |
440 | } |
441 | ||
442 | return false; | |
443 | } | |
444 | ||
41af3cf5 MH |
445 | static int append_trace_uprobe(struct trace_uprobe *tu, struct trace_uprobe *to) |
446 | { | |
447 | int ret; | |
448 | ||
fe60b0ce MH |
449 | ret = trace_probe_compare_arg_type(&tu->tp, &to->tp); |
450 | if (ret) { | |
451 | /* Note that argument starts index = 2 */ | |
452 | trace_probe_log_set_index(ret + 1); | |
453 | trace_probe_log_err(0, DIFF_ARG_TYPE); | |
454 | return -EEXIST; | |
455 | } | |
456 | if (trace_uprobe_has_same_uprobe(to, tu)) { | |
457 | trace_probe_log_set_index(0); | |
458 | trace_probe_log_err(0, SAME_PROBE); | |
459 | return -EEXIST; | |
460 | } | |
461 | ||
41af3cf5 MH |
462 | /* Append to existing event */ |
463 | ret = trace_probe_append(&tu->tp, &to->tp); | |
464 | if (!ret) | |
465 | dyn_event_add(&tu->devent); | |
466 | ||
467 | return ret; | |
468 | } | |
469 | ||
ccea8727 RB |
470 | /* |
471 | * Uprobe with multiple reference counter is not allowed. i.e. | |
472 | * If inode and offset matches, reference counter offset *must* | |
473 | * match as well. Though, there is one exception: If user is | |
474 | * replacing old trace_uprobe with new one(same group/event), | |
475 | * then we allow same uprobe with new reference counter as far | |
476 | * as the new one does not conflict with any other existing | |
477 | * ones. | |
478 | */ | |
41af3cf5 | 479 | static int validate_ref_ctr_offset(struct trace_uprobe *new) |
ccea8727 | 480 | { |
0597c49c | 481 | struct dyn_event *pos; |
41af3cf5 | 482 | struct trace_uprobe *tmp; |
ccea8727 RB |
483 | struct inode *new_inode = d_real_inode(new->path.dentry); |
484 | ||
0597c49c | 485 | for_each_trace_uprobe(tmp, pos) { |
41af3cf5 | 486 | if (new_inode == d_real_inode(tmp->path.dentry) && |
ccea8727 RB |
487 | new->offset == tmp->offset && |
488 | new->ref_ctr_offset != tmp->ref_ctr_offset) { | |
489 | pr_warn("Reference counter offset mismatch."); | |
41af3cf5 | 490 | return -EINVAL; |
ccea8727 RB |
491 | } |
492 | } | |
41af3cf5 | 493 | return 0; |
ccea8727 RB |
494 | } |
495 | ||
f3f096cf SD |
496 | /* Register a trace_uprobe and probe_event */ |
497 | static int register_trace_uprobe(struct trace_uprobe *tu) | |
498 | { | |
14577c39 | 499 | struct trace_uprobe *old_tu; |
f3f096cf SD |
500 | int ret; |
501 | ||
0597c49c | 502 | mutex_lock(&event_mutex); |
f3f096cf | 503 | |
41af3cf5 MH |
504 | ret = validate_ref_ctr_offset(tu); |
505 | if (ret) | |
ccea8727 | 506 | goto end; |
ccea8727 | 507 | |
41af3cf5 MH |
508 | /* register as an event */ |
509 | old_tu = find_probe_event(trace_probe_name(&tu->tp), | |
510 | trace_probe_group_name(&tu->tp)); | |
14577c39 | 511 | if (old_tu) { |
41af3cf5 MH |
512 | if (is_ret_probe(tu) != is_ret_probe(old_tu)) { |
513 | trace_probe_log_set_index(0); | |
514 | trace_probe_log_err(0, DIFF_PROBE_TYPE); | |
515 | ret = -EEXIST; | |
516 | } else { | |
fe60b0ce | 517 | ret = append_trace_uprobe(tu, old_tu); |
41af3cf5 MH |
518 | } |
519 | goto end; | |
c6c2401d | 520 | } |
f3f096cf SD |
521 | |
522 | ret = register_uprobe_event(tu); | |
523 | if (ret) { | |
a395d6a7 | 524 | pr_warn("Failed to register probe event(%d)\n", ret); |
f3f096cf SD |
525 | goto end; |
526 | } | |
527 | ||
0597c49c | 528 | dyn_event_add(&tu->devent); |
f3f096cf SD |
529 | |
530 | end: | |
0597c49c | 531 | mutex_unlock(&event_mutex); |
f3f096cf SD |
532 | |
533 | return ret; | |
534 | } | |
535 | ||
536 | /* | |
537 | * Argument syntax: | |
306cfe20 | 538 | * - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS] |
f3f096cf | 539 | */ |
0597c49c | 540 | static int trace_uprobe_create(int argc, const char **argv) |
f3f096cf SD |
541 | { |
542 | struct trace_uprobe *tu; | |
0597c49c MH |
543 | const char *event = NULL, *group = UPROBE_EVENT_SYSTEM; |
544 | char *arg, *filename, *rctr, *rctr_end, *tmp; | |
f3f096cf SD |
545 | char buf[MAX_EVENT_NAME_LEN]; |
546 | struct path path; | |
1cc33161 | 547 | unsigned long offset, ref_ctr_offset; |
0597c49c | 548 | bool is_return = false; |
f3f096cf SD |
549 | int i, ret; |
550 | ||
f3f096cf | 551 | ret = 0; |
1cc33161 | 552 | ref_ctr_offset = 0; |
f3f096cf | 553 | |
f01098c7 ET |
554 | switch (argv[0][0]) { |
555 | case 'r': | |
4ee5a52e | 556 | is_return = true; |
f01098c7 ET |
557 | break; |
558 | case 'p': | |
559 | break; | |
560 | default: | |
561 | return -ECANCELED; | |
562 | } | |
563 | ||
564 | if (argc < 2) | |
0597c49c | 565 | return -ECANCELED; |
f3f096cf | 566 | |
0597c49c | 567 | if (argv[0][1] == ':') |
f3f096cf | 568 | event = &argv[0][2]; |
f3f096cf | 569 | |
0597c49c MH |
570 | if (!strchr(argv[1], '/')) |
571 | return -ECANCELED; | |
f3f096cf | 572 | |
0597c49c MH |
573 | filename = kstrdup(argv[1], GFP_KERNEL); |
574 | if (!filename) | |
575 | return -ENOMEM; | |
f3f096cf | 576 | |
6496bb72 | 577 | /* Find the last occurrence, in case the path contains ':' too. */ |
0597c49c MH |
578 | arg = strrchr(filename, ':'); |
579 | if (!arg || !isdigit(arg[1])) { | |
580 | kfree(filename); | |
581 | return -ECANCELED; | |
582 | } | |
f3f096cf | 583 | |
ab105a4f MH |
584 | trace_probe_log_init("trace_uprobe", argc, argv); |
585 | trace_probe_log_set_index(1); /* filename is the 2nd argument */ | |
586 | ||
f3f096cf | 587 | *arg++ = '\0'; |
f3f096cf | 588 | ret = kern_path(filename, LOOKUP_FOLLOW, &path); |
0597c49c | 589 | if (ret) { |
ab105a4f | 590 | trace_probe_log_err(0, FILE_NOT_FOUND); |
0597c49c | 591 | kfree(filename); |
ab105a4f | 592 | trace_probe_log_clear(); |
0c92c7a3 | 593 | return ret; |
0597c49c | 594 | } |
0c92c7a3 | 595 | if (!d_is_reg(path.dentry)) { |
ab105a4f | 596 | trace_probe_log_err(0, NO_REGULAR_FILE); |
d24d7dbf JZ |
597 | ret = -EINVAL; |
598 | goto fail_address_parse; | |
599 | } | |
f3f096cf | 600 | |
1cc33161 RB |
601 | /* Parse reference counter offset if specified. */ |
602 | rctr = strchr(arg, '('); | |
603 | if (rctr) { | |
604 | rctr_end = strchr(rctr, ')'); | |
ab105a4f MH |
605 | if (!rctr_end) { |
606 | ret = -EINVAL; | |
607 | rctr_end = rctr + strlen(rctr); | |
608 | trace_probe_log_err(rctr_end - filename, | |
609 | REFCNT_OPEN_BRACE); | |
610 | goto fail_address_parse; | |
611 | } else if (rctr_end[1] != '\0') { | |
1cc33161 | 612 | ret = -EINVAL; |
ab105a4f MH |
613 | trace_probe_log_err(rctr_end + 1 - filename, |
614 | BAD_REFCNT_SUFFIX); | |
1cc33161 RB |
615 | goto fail_address_parse; |
616 | } | |
617 | ||
618 | *rctr++ = '\0'; | |
619 | *rctr_end = '\0'; | |
620 | ret = kstrtoul(rctr, 0, &ref_ctr_offset); | |
621 | if (ret) { | |
ab105a4f | 622 | trace_probe_log_err(rctr - filename, BAD_REFCNT); |
1cc33161 RB |
623 | goto fail_address_parse; |
624 | } | |
625 | } | |
626 | ||
627 | /* Parse uprobe offset. */ | |
84d7ed79 | 628 | ret = kstrtoul(arg, 0, &offset); |
ab105a4f MH |
629 | if (ret) { |
630 | trace_probe_log_err(arg - filename, BAD_UPROBE_OFFS); | |
84d7ed79 | 631 | goto fail_address_parse; |
ab105a4f | 632 | } |
f3f096cf SD |
633 | |
634 | /* setup a probe */ | |
ab105a4f | 635 | trace_probe_log_set_index(0); |
0597c49c | 636 | if (event) { |
ab105a4f MH |
637 | ret = traceprobe_parse_event_name(&event, &group, buf, |
638 | event - argv[0]); | |
0597c49c MH |
639 | if (ret) |
640 | goto fail_address_parse; | |
641 | } else { | |
b2e902f0 | 642 | char *tail; |
f3f096cf SD |
643 | char *ptr; |
644 | ||
b2e902f0 AS |
645 | tail = kstrdup(kbasename(filename), GFP_KERNEL); |
646 | if (!tail) { | |
f3f096cf SD |
647 | ret = -ENOMEM; |
648 | goto fail_address_parse; | |
649 | } | |
650 | ||
f3f096cf SD |
651 | ptr = strpbrk(tail, ".-_"); |
652 | if (ptr) | |
653 | *ptr = '\0'; | |
654 | ||
655 | snprintf(buf, MAX_EVENT_NAME_LEN, "%c_%s_0x%lx", 'p', tail, offset); | |
656 | event = buf; | |
657 | kfree(tail); | |
658 | } | |
659 | ||
ab105a4f MH |
660 | argc -= 2; |
661 | argv += 2; | |
662 | ||
4ee5a52e | 663 | tu = alloc_trace_uprobe(group, event, argc, is_return); |
f3f096cf | 664 | if (IS_ERR(tu)) { |
f3f096cf | 665 | ret = PTR_ERR(tu); |
a039480e MH |
666 | /* This must return -ENOMEM otherwise there is a bug */ |
667 | WARN_ON_ONCE(ret != -ENOMEM); | |
f3f096cf SD |
668 | goto fail_address_parse; |
669 | } | |
670 | tu->offset = offset; | |
1cc33161 | 671 | tu->ref_ctr_offset = ref_ctr_offset; |
0c92c7a3 | 672 | tu->path = path; |
0597c49c | 673 | tu->filename = filename; |
f3f096cf SD |
674 | |
675 | /* parse arguments */ | |
f3f096cf | 676 | for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) { |
0597c49c MH |
677 | tmp = kstrdup(argv[i], GFP_KERNEL); |
678 | if (!tmp) { | |
679 | ret = -ENOMEM; | |
680 | goto error; | |
681 | } | |
682 | ||
ab105a4f | 683 | trace_probe_log_set_index(i + 2); |
0597c49c | 684 | ret = traceprobe_parse_probe_arg(&tu->tp, i, tmp, |
a1303af5 | 685 | is_return ? TPARG_FL_RETURN : 0); |
0597c49c | 686 | kfree(tmp); |
d00bbea9 | 687 | if (ret) |
f3f096cf | 688 | goto error; |
f3f096cf SD |
689 | } |
690 | ||
b4d4b96b MH |
691 | ret = traceprobe_set_print_fmt(&tu->tp, is_ret_probe(tu)); |
692 | if (ret < 0) | |
693 | goto error; | |
694 | ||
f3f096cf | 695 | ret = register_trace_uprobe(tu); |
ab105a4f MH |
696 | if (!ret) |
697 | goto out; | |
f3f096cf SD |
698 | |
699 | error: | |
700 | free_trace_uprobe(tu); | |
ab105a4f MH |
701 | out: |
702 | trace_probe_log_clear(); | |
f3f096cf SD |
703 | return ret; |
704 | ||
705 | fail_address_parse: | |
ab105a4f | 706 | trace_probe_log_clear(); |
0c92c7a3 | 707 | path_put(&path); |
0597c49c | 708 | kfree(filename); |
f3f096cf | 709 | |
f3f096cf SD |
710 | return ret; |
711 | } | |
712 | ||
0597c49c | 713 | static int create_or_delete_trace_uprobe(int argc, char **argv) |
f3f096cf | 714 | { |
0597c49c | 715 | int ret; |
f3f096cf | 716 | |
0597c49c MH |
717 | if (argv[0][0] == '-') |
718 | return dyn_event_release(argc, argv, &trace_uprobe_ops); | |
f3f096cf | 719 | |
0597c49c MH |
720 | ret = trace_uprobe_create(argc, (const char **)argv); |
721 | return ret == -ECANCELED ? -EINVAL : ret; | |
f3f096cf SD |
722 | } |
723 | ||
0597c49c | 724 | static int trace_uprobe_release(struct dyn_event *ev) |
f3f096cf | 725 | { |
0597c49c | 726 | struct trace_uprobe *tu = to_trace_uprobe(ev); |
f3f096cf | 727 | |
0597c49c | 728 | return unregister_trace_uprobe(tu); |
f3f096cf SD |
729 | } |
730 | ||
0597c49c MH |
731 | /* Probes listing interfaces */ |
732 | static int trace_uprobe_show(struct seq_file *m, struct dyn_event *ev) | |
f3f096cf | 733 | { |
0597c49c | 734 | struct trace_uprobe *tu = to_trace_uprobe(ev); |
3ede82dd | 735 | char c = is_ret_probe(tu) ? 'r' : 'p'; |
f3f096cf SD |
736 | int i; |
737 | ||
b55ce203 MH |
738 | seq_printf(m, "%c:%s/%s %s:0x%0*lx", c, trace_probe_group_name(&tu->tp), |
739 | trace_probe_name(&tu->tp), tu->filename, | |
a64b2c01 | 740 | (int)(sizeof(void *) * 2), tu->offset); |
f3f096cf | 741 | |
1cc33161 RB |
742 | if (tu->ref_ctr_offset) |
743 | seq_printf(m, "(0x%lx)", tu->ref_ctr_offset); | |
744 | ||
14577c39 NK |
745 | for (i = 0; i < tu->tp.nr_args; i++) |
746 | seq_printf(m, " %s=%s", tu->tp.args[i].name, tu->tp.args[i].comm); | |
f3f096cf | 747 | |
fa6f0cc7 | 748 | seq_putc(m, '\n'); |
f3f096cf SD |
749 | return 0; |
750 | } | |
751 | ||
0597c49c MH |
752 | static int probes_seq_show(struct seq_file *m, void *v) |
753 | { | |
754 | struct dyn_event *ev = v; | |
755 | ||
756 | if (!is_trace_uprobe(ev)) | |
757 | return 0; | |
758 | ||
759 | return trace_uprobe_show(m, ev); | |
760 | } | |
761 | ||
f3f096cf | 762 | static const struct seq_operations probes_seq_op = { |
0597c49c MH |
763 | .start = dyn_event_seq_start, |
764 | .next = dyn_event_seq_next, | |
765 | .stop = dyn_event_seq_stop, | |
766 | .show = probes_seq_show | |
f3f096cf SD |
767 | }; |
768 | ||
769 | static int probes_open(struct inode *inode, struct file *file) | |
770 | { | |
c6c2401d SRRH |
771 | int ret; |
772 | ||
17911ff3 SRV |
773 | ret = security_locked_down(LOCKDOWN_TRACEFS); |
774 | if (ret) | |
775 | return ret; | |
776 | ||
c6c2401d | 777 | if ((file->f_mode & FMODE_WRITE) && (file->f_flags & O_TRUNC)) { |
0597c49c | 778 | ret = dyn_events_release_all(&trace_uprobe_ops); |
c6c2401d SRRH |
779 | if (ret) |
780 | return ret; | |
781 | } | |
f3f096cf SD |
782 | |
783 | return seq_open(file, &probes_seq_op); | |
784 | } | |
785 | ||
786 | static ssize_t probes_write(struct file *file, const char __user *buffer, | |
787 | size_t count, loff_t *ppos) | |
788 | { | |
0597c49c MH |
789 | return trace_parse_run_command(file, buffer, count, ppos, |
790 | create_or_delete_trace_uprobe); | |
f3f096cf SD |
791 | } |
792 | ||
793 | static const struct file_operations uprobe_events_ops = { | |
794 | .owner = THIS_MODULE, | |
795 | .open = probes_open, | |
796 | .read = seq_read, | |
797 | .llseek = seq_lseek, | |
798 | .release = seq_release, | |
799 | .write = probes_write, | |
800 | }; | |
801 | ||
802 | /* Probes profiling interfaces */ | |
803 | static int probes_profile_seq_show(struct seq_file *m, void *v) | |
804 | { | |
0597c49c MH |
805 | struct dyn_event *ev = v; |
806 | struct trace_uprobe *tu; | |
807 | ||
808 | if (!is_trace_uprobe(ev)) | |
809 | return 0; | |
f3f096cf | 810 | |
0597c49c | 811 | tu = to_trace_uprobe(ev); |
de7b2973 | 812 | seq_printf(m, " %s %-44s %15lu\n", tu->filename, |
b55ce203 | 813 | trace_probe_name(&tu->tp), tu->nhit); |
f3f096cf SD |
814 | return 0; |
815 | } | |
816 | ||
817 | static const struct seq_operations profile_seq_op = { | |
0597c49c MH |
818 | .start = dyn_event_seq_start, |
819 | .next = dyn_event_seq_next, | |
820 | .stop = dyn_event_seq_stop, | |
f3f096cf SD |
821 | .show = probes_profile_seq_show |
822 | }; | |
823 | ||
824 | static int profile_open(struct inode *inode, struct file *file) | |
825 | { | |
17911ff3 SRV |
826 | int ret; |
827 | ||
828 | ret = security_locked_down(LOCKDOWN_TRACEFS); | |
829 | if (ret) | |
830 | return ret; | |
831 | ||
f3f096cf SD |
832 | return seq_open(file, &profile_seq_op); |
833 | } | |
834 | ||
835 | static const struct file_operations uprobe_profile_ops = { | |
836 | .owner = THIS_MODULE, | |
837 | .open = profile_open, | |
838 | .read = seq_read, | |
839 | .llseek = seq_lseek, | |
840 | .release = seq_release, | |
841 | }; | |
842 | ||
dcad1a20 NK |
843 | struct uprobe_cpu_buffer { |
844 | struct mutex mutex; | |
845 | void *buf; | |
846 | }; | |
847 | static struct uprobe_cpu_buffer __percpu *uprobe_cpu_buffer; | |
848 | static int uprobe_buffer_refcnt; | |
849 | ||
850 | static int uprobe_buffer_init(void) | |
851 | { | |
852 | int cpu, err_cpu; | |
853 | ||
854 | uprobe_cpu_buffer = alloc_percpu(struct uprobe_cpu_buffer); | |
855 | if (uprobe_cpu_buffer == NULL) | |
856 | return -ENOMEM; | |
857 | ||
858 | for_each_possible_cpu(cpu) { | |
859 | struct page *p = alloc_pages_node(cpu_to_node(cpu), | |
860 | GFP_KERNEL, 0); | |
861 | if (p == NULL) { | |
862 | err_cpu = cpu; | |
863 | goto err; | |
864 | } | |
865 | per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf = page_address(p); | |
866 | mutex_init(&per_cpu_ptr(uprobe_cpu_buffer, cpu)->mutex); | |
867 | } | |
868 | ||
869 | return 0; | |
870 | ||
871 | err: | |
872 | for_each_possible_cpu(cpu) { | |
873 | if (cpu == err_cpu) | |
874 | break; | |
875 | free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, cpu)->buf); | |
876 | } | |
877 | ||
878 | free_percpu(uprobe_cpu_buffer); | |
879 | return -ENOMEM; | |
880 | } | |
881 | ||
882 | static int uprobe_buffer_enable(void) | |
883 | { | |
884 | int ret = 0; | |
885 | ||
886 | BUG_ON(!mutex_is_locked(&event_mutex)); | |
887 | ||
888 | if (uprobe_buffer_refcnt++ == 0) { | |
889 | ret = uprobe_buffer_init(); | |
890 | if (ret < 0) | |
891 | uprobe_buffer_refcnt--; | |
892 | } | |
893 | ||
894 | return ret; | |
895 | } | |
896 | ||
897 | static void uprobe_buffer_disable(void) | |
898 | { | |
6ea6215f J |
899 | int cpu; |
900 | ||
dcad1a20 NK |
901 | BUG_ON(!mutex_is_locked(&event_mutex)); |
902 | ||
903 | if (--uprobe_buffer_refcnt == 0) { | |
6ea6215f J |
904 | for_each_possible_cpu(cpu) |
905 | free_page((unsigned long)per_cpu_ptr(uprobe_cpu_buffer, | |
906 | cpu)->buf); | |
907 | ||
dcad1a20 NK |
908 | free_percpu(uprobe_cpu_buffer); |
909 | uprobe_cpu_buffer = NULL; | |
910 | } | |
911 | } | |
912 | ||
913 | static struct uprobe_cpu_buffer *uprobe_buffer_get(void) | |
914 | { | |
915 | struct uprobe_cpu_buffer *ucb; | |
916 | int cpu; | |
917 | ||
918 | cpu = raw_smp_processor_id(); | |
919 | ucb = per_cpu_ptr(uprobe_cpu_buffer, cpu); | |
920 | ||
921 | /* | |
922 | * Use per-cpu buffers for fastest access, but we might migrate | |
923 | * so the mutex makes sure we have sole access to it. | |
924 | */ | |
925 | mutex_lock(&ucb->mutex); | |
926 | ||
927 | return ucb; | |
928 | } | |
929 | ||
930 | static void uprobe_buffer_put(struct uprobe_cpu_buffer *ucb) | |
931 | { | |
932 | mutex_unlock(&ucb->mutex); | |
933 | } | |
934 | ||
a43b9704 | 935 | static void __uprobe_trace_func(struct trace_uprobe *tu, |
dd9fa555 | 936 | unsigned long func, struct pt_regs *regs, |
70ed91c6 | 937 | struct uprobe_cpu_buffer *ucb, int dsize, |
7f1d2f82 | 938 | struct trace_event_file *trace_file) |
f3f096cf SD |
939 | { |
940 | struct uprobe_trace_entry_head *entry; | |
941 | struct ring_buffer_event *event; | |
942 | struct ring_buffer *buffer; | |
457d1772 | 943 | void *data; |
dd9fa555 | 944 | int size, esize; |
e3dc9f89 | 945 | struct trace_event_call *call = trace_probe_event_call(&tu->tp); |
f3f096cf | 946 | |
7f1d2f82 | 947 | WARN_ON(call != trace_file->event_call); |
70ed91c6 | 948 | |
dd9fa555 | 949 | if (WARN_ON_ONCE(tu->tp.size + dsize > PAGE_SIZE)) |
dcad1a20 NK |
950 | return; |
951 | ||
09a5059a | 952 | if (trace_trigger_soft_disabled(trace_file)) |
ca3b1620 NK |
953 | return; |
954 | ||
dd9fa555 | 955 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); |
dcad1a20 | 956 | size = esize + tu->tp.size + dsize; |
7f1d2f82 | 957 | event = trace_event_buffer_lock_reserve(&buffer, trace_file, |
70ed91c6 | 958 | call->event.type, size, 0, 0); |
f3f096cf | 959 | if (!event) |
dd9fa555 | 960 | return; |
f3f096cf SD |
961 | |
962 | entry = ring_buffer_event_data(event); | |
393a736c ON |
963 | if (is_ret_probe(tu)) { |
964 | entry->vaddr[0] = func; | |
965 | entry->vaddr[1] = instruction_pointer(regs); | |
966 | data = DATAOF_TRACE_ENTRY(entry, true); | |
967 | } else { | |
968 | entry->vaddr[0] = instruction_pointer(regs); | |
969 | data = DATAOF_TRACE_ENTRY(entry, false); | |
970 | } | |
971 | ||
dcad1a20 | 972 | memcpy(data, ucb->buf, tu->tp.size + dsize); |
f3f096cf | 973 | |
7f1d2f82 | 974 | event_trigger_unlock_commit(trace_file, buffer, event, entry, 0, 0); |
a51cc604 | 975 | } |
f42d24a1 | 976 | |
a51cc604 | 977 | /* uprobe handler */ |
dd9fa555 NK |
978 | static int uprobe_trace_func(struct trace_uprobe *tu, struct pt_regs *regs, |
979 | struct uprobe_cpu_buffer *ucb, int dsize) | |
a51cc604 | 980 | { |
70ed91c6 J |
981 | struct event_file_link *link; |
982 | ||
983 | if (is_ret_probe(tu)) | |
984 | return 0; | |
985 | ||
986 | rcu_read_lock(); | |
b5f935ee | 987 | trace_probe_for_each_link_rcu(link, &tu->tp) |
70ed91c6 J |
988 | __uprobe_trace_func(tu, 0, regs, ucb, dsize, link->file); |
989 | rcu_read_unlock(); | |
990 | ||
f42d24a1 | 991 | return 0; |
f3f096cf SD |
992 | } |
993 | ||
c1ae5c75 | 994 | static void uretprobe_trace_func(struct trace_uprobe *tu, unsigned long func, |
dd9fa555 NK |
995 | struct pt_regs *regs, |
996 | struct uprobe_cpu_buffer *ucb, int dsize) | |
c1ae5c75 | 997 | { |
70ed91c6 J |
998 | struct event_file_link *link; |
999 | ||
1000 | rcu_read_lock(); | |
b5f935ee | 1001 | trace_probe_for_each_link_rcu(link, &tu->tp) |
70ed91c6 J |
1002 | __uprobe_trace_func(tu, func, regs, ucb, dsize, link->file); |
1003 | rcu_read_unlock(); | |
c1ae5c75 ON |
1004 | } |
1005 | ||
f3f096cf SD |
1006 | /* Event entry printers */ |
1007 | static enum print_line_t | |
1008 | print_uprobe_event(struct trace_iterator *iter, int flags, struct trace_event *event) | |
1009 | { | |
457d1772 | 1010 | struct uprobe_trace_entry_head *entry; |
f3f096cf SD |
1011 | struct trace_seq *s = &iter->seq; |
1012 | struct trace_uprobe *tu; | |
1013 | u8 *data; | |
f3f096cf | 1014 | |
457d1772 | 1015 | entry = (struct uprobe_trace_entry_head *)iter->ent; |
60d53e2c MH |
1016 | tu = trace_uprobe_primary_from_call( |
1017 | container_of(event, struct trace_event_call, event)); | |
1018 | if (unlikely(!tu)) | |
1019 | goto out; | |
f3f096cf | 1020 | |
3ede82dd | 1021 | if (is_ret_probe(tu)) { |
8579a107 | 1022 | trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)", |
b55ce203 | 1023 | trace_probe_name(&tu->tp), |
8579a107 | 1024 | entry->vaddr[1], entry->vaddr[0]); |
3ede82dd ON |
1025 | data = DATAOF_TRACE_ENTRY(entry, true); |
1026 | } else { | |
8579a107 | 1027 | trace_seq_printf(s, "%s: (0x%lx)", |
b55ce203 | 1028 | trace_probe_name(&tu->tp), |
8579a107 | 1029 | entry->vaddr[0]); |
3ede82dd ON |
1030 | data = DATAOF_TRACE_ENTRY(entry, false); |
1031 | } | |
f3f096cf | 1032 | |
56de7630 MH |
1033 | if (print_probe_args(s, tu->tp.args, tu->tp.nr_args, data, entry) < 0) |
1034 | goto out; | |
f3f096cf | 1035 | |
8579a107 | 1036 | trace_seq_putc(s, '\n'); |
f3f096cf | 1037 | |
8579a107 SRRH |
1038 | out: |
1039 | return trace_handle_return(s); | |
f3f096cf SD |
1040 | } |
1041 | ||
31ba3348 ON |
1042 | typedef bool (*filter_func_t)(struct uprobe_consumer *self, |
1043 | enum uprobe_filter_ctx ctx, | |
1044 | struct mm_struct *mm); | |
1045 | ||
60d53e2c | 1046 | static int trace_uprobe_enable(struct trace_uprobe *tu, filter_func_t filter) |
f3f096cf | 1047 | { |
70ed91c6 J |
1048 | int ret; |
1049 | ||
60d53e2c MH |
1050 | tu->consumer.filter = filter; |
1051 | tu->inode = d_real_inode(tu->path.dentry); | |
1052 | ||
1053 | if (tu->ref_ctr_offset) | |
1054 | ret = uprobe_register_refctr(tu->inode, tu->offset, | |
1055 | tu->ref_ctr_offset, &tu->consumer); | |
1056 | else | |
1057 | ret = uprobe_register(tu->inode, tu->offset, &tu->consumer); | |
1058 | ||
1059 | if (ret) | |
1060 | tu->inode = NULL; | |
1061 | ||
1062 | return ret; | |
1063 | } | |
1064 | ||
1065 | static void __probe_event_disable(struct trace_probe *tp) | |
1066 | { | |
1067 | struct trace_probe *pos; | |
1068 | struct trace_uprobe *tu; | |
1069 | ||
1070 | list_for_each_entry(pos, trace_probe_probe_list(tp), list) { | |
1071 | tu = container_of(pos, struct trace_uprobe, tp); | |
1072 | if (!tu->inode) | |
1073 | continue; | |
1074 | ||
1075 | WARN_ON(!uprobe_filter_is_empty(&tu->filter)); | |
1076 | ||
1077 | uprobe_unregister(tu->inode, tu->offset, &tu->consumer); | |
1078 | tu->inode = NULL; | |
1079 | } | |
1080 | } | |
1081 | ||
1082 | static int probe_event_enable(struct trace_event_call *call, | |
1083 | struct trace_event_file *file, filter_func_t filter) | |
1084 | { | |
1085 | struct trace_probe *pos, *tp; | |
1086 | struct trace_uprobe *tu; | |
1087 | bool enabled; | |
1088 | int ret; | |
1089 | ||
1090 | tp = trace_probe_primary_from_call(call); | |
1091 | if (WARN_ON_ONCE(!tp)) | |
1092 | return -ENODEV; | |
1093 | enabled = trace_probe_is_enabled(tp); | |
1094 | ||
1095 | /* This may also change "enabled" state */ | |
70ed91c6 | 1096 | if (file) { |
60d53e2c | 1097 | if (trace_probe_test_flag(tp, TP_FLAG_PROFILE)) |
48212542 ON |
1098 | return -EINTR; |
1099 | ||
60d53e2c | 1100 | ret = trace_probe_add_file(tp, file); |
b5f935ee MH |
1101 | if (ret < 0) |
1102 | return ret; | |
48212542 | 1103 | } else { |
60d53e2c | 1104 | if (trace_probe_test_flag(tp, TP_FLAG_TRACE)) |
48212542 ON |
1105 | return -EINTR; |
1106 | ||
60d53e2c | 1107 | trace_probe_set_flag(tp, TP_FLAG_PROFILE); |
48212542 | 1108 | } |
f3f096cf | 1109 | |
60d53e2c | 1110 | tu = container_of(tp, struct trace_uprobe, tp); |
736288ba ON |
1111 | WARN_ON(!uprobe_filter_is_empty(&tu->filter)); |
1112 | ||
70ed91c6 J |
1113 | if (enabled) |
1114 | return 0; | |
1115 | ||
fb6bab6a ON |
1116 | ret = uprobe_buffer_enable(); |
1117 | if (ret) | |
1118 | goto err_flags; | |
1119 | ||
60d53e2c MH |
1120 | list_for_each_entry(pos, trace_probe_probe_list(tp), list) { |
1121 | tu = container_of(pos, struct trace_uprobe, tp); | |
1122 | ret = trace_uprobe_enable(tu, filter); | |
1123 | if (ret) { | |
1124 | __probe_event_disable(tp); | |
1125 | goto err_buffer; | |
1126 | } | |
1cc33161 RB |
1127 | } |
1128 | ||
fb6bab6a ON |
1129 | return 0; |
1130 | ||
1131 | err_buffer: | |
1132 | uprobe_buffer_disable(); | |
f3f096cf | 1133 | |
fb6bab6a | 1134 | err_flags: |
b5f935ee | 1135 | if (file) |
60d53e2c | 1136 | trace_probe_remove_file(tp, file); |
b5f935ee | 1137 | else |
60d53e2c | 1138 | trace_probe_clear_flag(tp, TP_FLAG_PROFILE); |
b5f935ee | 1139 | |
4161824f | 1140 | return ret; |
f3f096cf SD |
1141 | } |
1142 | ||
60d53e2c MH |
1143 | static void probe_event_disable(struct trace_event_call *call, |
1144 | struct trace_event_file *file) | |
f3f096cf | 1145 | { |
60d53e2c MH |
1146 | struct trace_probe *tp; |
1147 | ||
1148 | tp = trace_probe_primary_from_call(call); | |
1149 | if (WARN_ON_ONCE(!tp)) | |
1150 | return; | |
1151 | ||
1152 | if (!trace_probe_is_enabled(tp)) | |
f3f096cf SD |
1153 | return; |
1154 | ||
70ed91c6 | 1155 | if (file) { |
60d53e2c | 1156 | if (trace_probe_remove_file(tp, file) < 0) |
70ed91c6 J |
1157 | return; |
1158 | ||
60d53e2c | 1159 | if (trace_probe_is_enabled(tp)) |
70ed91c6 | 1160 | return; |
b5f935ee | 1161 | } else |
60d53e2c | 1162 | trace_probe_clear_flag(tp, TP_FLAG_PROFILE); |
dcad1a20 | 1163 | |
60d53e2c | 1164 | __probe_event_disable(tp); |
dcad1a20 | 1165 | uprobe_buffer_disable(); |
f3f096cf SD |
1166 | } |
1167 | ||
2425bcb9 | 1168 | static int uprobe_event_define_fields(struct trace_event_call *event_call) |
f3f096cf | 1169 | { |
eeb07b06 | 1170 | int ret, size; |
f3f096cf | 1171 | struct uprobe_trace_entry_head field; |
60d53e2c MH |
1172 | struct trace_uprobe *tu; |
1173 | ||
1174 | tu = trace_uprobe_primary_from_call(event_call); | |
1175 | if (unlikely(!tu)) | |
1176 | return -ENODEV; | |
f3f096cf | 1177 | |
4d1298e2 ON |
1178 | if (is_ret_probe(tu)) { |
1179 | DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_FUNC, 0); | |
1180 | DEFINE_FIELD(unsigned long, vaddr[1], FIELD_STRING_RETIP, 0); | |
1181 | size = SIZEOF_TRACE_ENTRY(true); | |
1182 | } else { | |
1183 | DEFINE_FIELD(unsigned long, vaddr[0], FIELD_STRING_IP, 0); | |
1184 | size = SIZEOF_TRACE_ENTRY(false); | |
1185 | } | |
f3f096cf | 1186 | |
eeb07b06 | 1187 | return traceprobe_define_arg_fields(event_call, size, &tu->tp); |
f3f096cf SD |
1188 | } |
1189 | ||
f3f096cf | 1190 | #ifdef CONFIG_PERF_EVENTS |
31ba3348 ON |
1191 | static bool |
1192 | __uprobe_perf_filter(struct trace_uprobe_filter *filter, struct mm_struct *mm) | |
1193 | { | |
1194 | struct perf_event *event; | |
1195 | ||
1196 | if (filter->nr_systemwide) | |
1197 | return true; | |
1198 | ||
1199 | list_for_each_entry(event, &filter->perf_events, hw.tp_list) { | |
50f16a8b | 1200 | if (event->hw.target->mm == mm) |
31ba3348 ON |
1201 | return true; |
1202 | } | |
1203 | ||
1204 | return false; | |
1205 | } | |
1206 | ||
b2fe8ba6 ON |
1207 | static inline bool |
1208 | uprobe_filter_event(struct trace_uprobe *tu, struct perf_event *event) | |
1209 | { | |
50f16a8b | 1210 | return __uprobe_perf_filter(&tu->filter, event->hw.target->mm); |
b2fe8ba6 ON |
1211 | } |
1212 | ||
ce5f36a5 | 1213 | static int uprobe_perf_close(struct trace_uprobe *tu, struct perf_event *event) |
736288ba | 1214 | { |
b2fe8ba6 ON |
1215 | bool done; |
1216 | ||
736288ba | 1217 | write_lock(&tu->filter.rwlock); |
50f16a8b | 1218 | if (event->hw.target) { |
ce5f36a5 | 1219 | list_del(&event->hw.tp_list); |
b2fe8ba6 | 1220 | done = tu->filter.nr_systemwide || |
50f16a8b | 1221 | (event->hw.target->flags & PF_EXITING) || |
b2fe8ba6 | 1222 | uprobe_filter_event(tu, event); |
b2fe8ba6 | 1223 | } else { |
ce5f36a5 | 1224 | tu->filter.nr_systemwide--; |
b2fe8ba6 | 1225 | done = tu->filter.nr_systemwide; |
b2fe8ba6 | 1226 | } |
736288ba ON |
1227 | write_unlock(&tu->filter.rwlock); |
1228 | ||
b2fe8ba6 | 1229 | if (!done) |
927d6874 | 1230 | return uprobe_apply(tu->inode, tu->offset, &tu->consumer, false); |
31ba3348 | 1231 | |
736288ba ON |
1232 | return 0; |
1233 | } | |
1234 | ||
ce5f36a5 | 1235 | static int uprobe_perf_open(struct trace_uprobe *tu, struct perf_event *event) |
736288ba | 1236 | { |
b2fe8ba6 | 1237 | bool done; |
927d6874 | 1238 | int err; |
b2fe8ba6 | 1239 | |
736288ba | 1240 | write_lock(&tu->filter.rwlock); |
50f16a8b | 1241 | if (event->hw.target) { |
ce5f36a5 ON |
1242 | /* |
1243 | * event->parent != NULL means copy_process(), we can avoid | |
1244 | * uprobe_apply(). current->mm must be probed and we can rely | |
1245 | * on dup_mmap() which preserves the already installed bp's. | |
1246 | * | |
1247 | * attr.enable_on_exec means that exec/mmap will install the | |
1248 | * breakpoints we need. | |
1249 | */ | |
b2fe8ba6 | 1250 | done = tu->filter.nr_systemwide || |
ce5f36a5 | 1251 | event->parent || event->attr.enable_on_exec || |
b2fe8ba6 | 1252 | uprobe_filter_event(tu, event); |
ce5f36a5 | 1253 | list_add(&event->hw.tp_list, &tu->filter.perf_events); |
b2fe8ba6 | 1254 | } else { |
b2fe8ba6 | 1255 | done = tu->filter.nr_systemwide; |
ce5f36a5 | 1256 | tu->filter.nr_systemwide++; |
b2fe8ba6 | 1257 | } |
736288ba ON |
1258 | write_unlock(&tu->filter.rwlock); |
1259 | ||
927d6874 ON |
1260 | err = 0; |
1261 | if (!done) { | |
1262 | err = uprobe_apply(tu->inode, tu->offset, &tu->consumer, true); | |
1263 | if (err) | |
1264 | uprobe_perf_close(tu, event); | |
1265 | } | |
1266 | return err; | |
736288ba ON |
1267 | } |
1268 | ||
60d53e2c MH |
1269 | static int uprobe_perf_multi_call(struct trace_event_call *call, |
1270 | struct perf_event *event, | |
1271 | int (*op)(struct trace_uprobe *tu, struct perf_event *event)) | |
1272 | { | |
1273 | struct trace_probe *pos, *tp; | |
1274 | struct trace_uprobe *tu; | |
1275 | int ret = 0; | |
1276 | ||
1277 | tp = trace_probe_primary_from_call(call); | |
1278 | if (WARN_ON_ONCE(!tp)) | |
1279 | return -ENODEV; | |
1280 | ||
1281 | list_for_each_entry(pos, trace_probe_probe_list(tp), list) { | |
1282 | tu = container_of(pos, struct trace_uprobe, tp); | |
1283 | ret = op(tu, event); | |
1284 | if (ret) | |
1285 | break; | |
1286 | } | |
1287 | ||
1288 | return ret; | |
1289 | } | |
31ba3348 ON |
1290 | static bool uprobe_perf_filter(struct uprobe_consumer *uc, |
1291 | enum uprobe_filter_ctx ctx, struct mm_struct *mm) | |
1292 | { | |
1293 | struct trace_uprobe *tu; | |
1294 | int ret; | |
1295 | ||
1296 | tu = container_of(uc, struct trace_uprobe, consumer); | |
1297 | read_lock(&tu->filter.rwlock); | |
1298 | ret = __uprobe_perf_filter(&tu->filter, mm); | |
1299 | read_unlock(&tu->filter.rwlock); | |
1300 | ||
1301 | return ret; | |
1302 | } | |
1303 | ||
a43b9704 | 1304 | static void __uprobe_perf_func(struct trace_uprobe *tu, |
dd9fa555 NK |
1305 | unsigned long func, struct pt_regs *regs, |
1306 | struct uprobe_cpu_buffer *ucb, int dsize) | |
f3f096cf | 1307 | { |
e3dc9f89 | 1308 | struct trace_event_call *call = trace_probe_event_call(&tu->tp); |
f3f096cf SD |
1309 | struct uprobe_trace_entry_head *entry; |
1310 | struct hlist_head *head; | |
457d1772 | 1311 | void *data; |
dd9fa555 | 1312 | int size, esize; |
dcad1a20 NK |
1313 | int rctx; |
1314 | ||
e87c6bc3 | 1315 | if (bpf_prog_array_valid(call) && !trace_call_bpf(call, regs)) |
04a22fae WN |
1316 | return; |
1317 | ||
dcad1a20 | 1318 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); |
f3f096cf | 1319 | |
dcad1a20 NK |
1320 | size = esize + tu->tp.size + dsize; |
1321 | size = ALIGN(size + sizeof(u32), sizeof(u64)) - sizeof(u32); | |
1322 | if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large enough")) | |
1323 | return; | |
1324 | ||
f3f096cf | 1325 | preempt_disable(); |
515619f2 ON |
1326 | head = this_cpu_ptr(call->perf_events); |
1327 | if (hlist_empty(head)) | |
1328 | goto out; | |
1329 | ||
1e1dcd93 | 1330 | entry = perf_trace_buf_alloc(size, NULL, &rctx); |
f3f096cf SD |
1331 | if (!entry) |
1332 | goto out; | |
1333 | ||
393a736c ON |
1334 | if (is_ret_probe(tu)) { |
1335 | entry->vaddr[0] = func; | |
32520b2c | 1336 | entry->vaddr[1] = instruction_pointer(regs); |
393a736c ON |
1337 | data = DATAOF_TRACE_ENTRY(entry, true); |
1338 | } else { | |
32520b2c | 1339 | entry->vaddr[0] = instruction_pointer(regs); |
393a736c ON |
1340 | data = DATAOF_TRACE_ENTRY(entry, false); |
1341 | } | |
1342 | ||
dcad1a20 NK |
1343 | memcpy(data, ucb->buf, tu->tp.size + dsize); |
1344 | ||
1345 | if (size - esize > tu->tp.size + dsize) { | |
1346 | int len = tu->tp.size + dsize; | |
14577c39 | 1347 | |
dcad1a20 | 1348 | memset(data + len, 0, size - esize - len); |
14577c39 | 1349 | } |
f3f096cf | 1350 | |
1e1dcd93 | 1351 | perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, |
8fd0fbbe | 1352 | head, NULL); |
f3f096cf SD |
1353 | out: |
1354 | preempt_enable(); | |
a51cc604 ON |
1355 | } |
1356 | ||
1357 | /* uprobe profile handler */ | |
dd9fa555 NK |
1358 | static int uprobe_perf_func(struct trace_uprobe *tu, struct pt_regs *regs, |
1359 | struct uprobe_cpu_buffer *ucb, int dsize) | |
a51cc604 ON |
1360 | { |
1361 | if (!uprobe_perf_filter(&tu->consumer, 0, current->mm)) | |
1362 | return UPROBE_HANDLER_REMOVE; | |
1363 | ||
393a736c | 1364 | if (!is_ret_probe(tu)) |
dd9fa555 | 1365 | __uprobe_perf_func(tu, 0, regs, ucb, dsize); |
f42d24a1 | 1366 | return 0; |
f3f096cf | 1367 | } |
c1ae5c75 ON |
1368 | |
1369 | static void uretprobe_perf_func(struct trace_uprobe *tu, unsigned long func, | |
dd9fa555 NK |
1370 | struct pt_regs *regs, |
1371 | struct uprobe_cpu_buffer *ucb, int dsize) | |
c1ae5c75 | 1372 | { |
dd9fa555 | 1373 | __uprobe_perf_func(tu, func, regs, ucb, dsize); |
c1ae5c75 | 1374 | } |
41bdc4b4 YS |
1375 | |
1376 | int bpf_get_uprobe_info(const struct perf_event *event, u32 *fd_type, | |
1377 | const char **filename, u64 *probe_offset, | |
1378 | bool perf_type_tracepoint) | |
1379 | { | |
1380 | const char *pevent = trace_event_name(event->tp_event); | |
1381 | const char *group = event->tp_event->class->system; | |
1382 | struct trace_uprobe *tu; | |
1383 | ||
1384 | if (perf_type_tracepoint) | |
1385 | tu = find_probe_event(pevent, group); | |
1386 | else | |
1387 | tu = event->tp_event->data; | |
1388 | if (!tu) | |
1389 | return -EINVAL; | |
1390 | ||
1391 | *fd_type = is_ret_probe(tu) ? BPF_FD_TYPE_URETPROBE | |
1392 | : BPF_FD_TYPE_UPROBE; | |
1393 | *filename = tu->filename; | |
1394 | *probe_offset = tu->offset; | |
1395 | return 0; | |
1396 | } | |
f3f096cf SD |
1397 | #endif /* CONFIG_PERF_EVENTS */ |
1398 | ||
70ed91c6 | 1399 | static int |
2425bcb9 | 1400 | trace_uprobe_register(struct trace_event_call *event, enum trace_reg type, |
70ed91c6 | 1401 | void *data) |
f3f096cf | 1402 | { |
7f1d2f82 | 1403 | struct trace_event_file *file = data; |
f3f096cf SD |
1404 | |
1405 | switch (type) { | |
1406 | case TRACE_REG_REGISTER: | |
60d53e2c | 1407 | return probe_event_enable(event, file, NULL); |
f3f096cf SD |
1408 | |
1409 | case TRACE_REG_UNREGISTER: | |
60d53e2c | 1410 | probe_event_disable(event, file); |
f3f096cf SD |
1411 | return 0; |
1412 | ||
1413 | #ifdef CONFIG_PERF_EVENTS | |
1414 | case TRACE_REG_PERF_REGISTER: | |
60d53e2c | 1415 | return probe_event_enable(event, NULL, uprobe_perf_filter); |
f3f096cf SD |
1416 | |
1417 | case TRACE_REG_PERF_UNREGISTER: | |
60d53e2c | 1418 | probe_event_disable(event, NULL); |
f3f096cf | 1419 | return 0; |
736288ba ON |
1420 | |
1421 | case TRACE_REG_PERF_OPEN: | |
60d53e2c | 1422 | return uprobe_perf_multi_call(event, data, uprobe_perf_open); |
736288ba ON |
1423 | |
1424 | case TRACE_REG_PERF_CLOSE: | |
60d53e2c | 1425 | return uprobe_perf_multi_call(event, data, uprobe_perf_close); |
736288ba | 1426 | |
f3f096cf SD |
1427 | #endif |
1428 | default: | |
1429 | return 0; | |
1430 | } | |
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs) | |
1435 | { | |
f3f096cf | 1436 | struct trace_uprobe *tu; |
b7e0bf34 | 1437 | struct uprobe_dispatch_data udd; |
dd9fa555 NK |
1438 | struct uprobe_cpu_buffer *ucb; |
1439 | int dsize, esize; | |
f42d24a1 | 1440 | int ret = 0; |
f3f096cf | 1441 | |
dd9fa555 | 1442 | |
a932b738 | 1443 | tu = container_of(con, struct trace_uprobe, consumer); |
1b47aefd | 1444 | tu->nhit++; |
f3f096cf | 1445 | |
b7e0bf34 NK |
1446 | udd.tu = tu; |
1447 | udd.bp_addr = instruction_pointer(regs); | |
1448 | ||
1449 | current->utask->vaddr = (unsigned long) &udd; | |
1450 | ||
dd9fa555 NK |
1451 | if (WARN_ON_ONCE(!uprobe_cpu_buffer)) |
1452 | return 0; | |
1453 | ||
1454 | dsize = __get_data_size(&tu->tp, regs); | |
1455 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); | |
1456 | ||
1457 | ucb = uprobe_buffer_get(); | |
9178412d | 1458 | store_trace_args(ucb->buf, &tu->tp, regs, esize, dsize); |
dd9fa555 | 1459 | |
747774d6 | 1460 | if (trace_probe_test_flag(&tu->tp, TP_FLAG_TRACE)) |
dd9fa555 | 1461 | ret |= uprobe_trace_func(tu, regs, ucb, dsize); |
f3f096cf SD |
1462 | |
1463 | #ifdef CONFIG_PERF_EVENTS | |
747774d6 | 1464 | if (trace_probe_test_flag(&tu->tp, TP_FLAG_PROFILE)) |
dd9fa555 | 1465 | ret |= uprobe_perf_func(tu, regs, ucb, dsize); |
f3f096cf | 1466 | #endif |
dd9fa555 | 1467 | uprobe_buffer_put(ucb); |
f42d24a1 | 1468 | return ret; |
f3f096cf SD |
1469 | } |
1470 | ||
c1ae5c75 ON |
1471 | static int uretprobe_dispatcher(struct uprobe_consumer *con, |
1472 | unsigned long func, struct pt_regs *regs) | |
1473 | { | |
1474 | struct trace_uprobe *tu; | |
b7e0bf34 | 1475 | struct uprobe_dispatch_data udd; |
dd9fa555 NK |
1476 | struct uprobe_cpu_buffer *ucb; |
1477 | int dsize, esize; | |
c1ae5c75 ON |
1478 | |
1479 | tu = container_of(con, struct trace_uprobe, consumer); | |
1480 | ||
b7e0bf34 NK |
1481 | udd.tu = tu; |
1482 | udd.bp_addr = func; | |
1483 | ||
1484 | current->utask->vaddr = (unsigned long) &udd; | |
1485 | ||
dd9fa555 NK |
1486 | if (WARN_ON_ONCE(!uprobe_cpu_buffer)) |
1487 | return 0; | |
1488 | ||
1489 | dsize = __get_data_size(&tu->tp, regs); | |
1490 | esize = SIZEOF_TRACE_ENTRY(is_ret_probe(tu)); | |
1491 | ||
1492 | ucb = uprobe_buffer_get(); | |
9178412d | 1493 | store_trace_args(ucb->buf, &tu->tp, regs, esize, dsize); |
dd9fa555 | 1494 | |
747774d6 | 1495 | if (trace_probe_test_flag(&tu->tp, TP_FLAG_TRACE)) |
dd9fa555 | 1496 | uretprobe_trace_func(tu, func, regs, ucb, dsize); |
c1ae5c75 ON |
1497 | |
1498 | #ifdef CONFIG_PERF_EVENTS | |
747774d6 | 1499 | if (trace_probe_test_flag(&tu->tp, TP_FLAG_PROFILE)) |
dd9fa555 | 1500 | uretprobe_perf_func(tu, func, regs, ucb, dsize); |
c1ae5c75 | 1501 | #endif |
dd9fa555 | 1502 | uprobe_buffer_put(ucb); |
c1ae5c75 ON |
1503 | return 0; |
1504 | } | |
1505 | ||
f3f096cf SD |
1506 | static struct trace_event_functions uprobe_funcs = { |
1507 | .trace = print_uprobe_event | |
1508 | }; | |
1509 | ||
e3dc9f89 | 1510 | static inline void init_trace_event_call(struct trace_uprobe *tu) |
f3f096cf | 1511 | { |
e3dc9f89 MH |
1512 | struct trace_event_call *call = trace_probe_event_call(&tu->tp); |
1513 | ||
f3f096cf SD |
1514 | call->event.funcs = &uprobe_funcs; |
1515 | call->class->define_fields = uprobe_event_define_fields; | |
1516 | ||
9fd2e48b | 1517 | call->flags = TRACE_EVENT_FL_UPROBE | TRACE_EVENT_FL_CAP_ANY; |
33ea4b24 | 1518 | call->class->reg = trace_uprobe_register; |
33ea4b24 SL |
1519 | } |
1520 | ||
1521 | static int register_uprobe_event(struct trace_uprobe *tu) | |
1522 | { | |
e3dc9f89 | 1523 | init_trace_event_call(tu); |
f3f096cf | 1524 | |
46e5376d | 1525 | return trace_probe_register_event_call(&tu->tp); |
f3f096cf SD |
1526 | } |
1527 | ||
c6c2401d | 1528 | static int unregister_uprobe_event(struct trace_uprobe *tu) |
f3f096cf | 1529 | { |
46e5376d | 1530 | return trace_probe_unregister_event_call(&tu->tp); |
f3f096cf SD |
1531 | } |
1532 | ||
33ea4b24 SL |
1533 | #ifdef CONFIG_PERF_EVENTS |
1534 | struct trace_event_call * | |
a6ca88b2 SL |
1535 | create_local_trace_uprobe(char *name, unsigned long offs, |
1536 | unsigned long ref_ctr_offset, bool is_return) | |
33ea4b24 SL |
1537 | { |
1538 | struct trace_uprobe *tu; | |
33ea4b24 SL |
1539 | struct path path; |
1540 | int ret; | |
1541 | ||
1542 | ret = kern_path(name, LOOKUP_FOLLOW, &path); | |
1543 | if (ret) | |
1544 | return ERR_PTR(ret); | |
1545 | ||
0c92c7a3 SL |
1546 | if (!d_is_reg(path.dentry)) { |
1547 | path_put(&path); | |
33ea4b24 SL |
1548 | return ERR_PTR(-EINVAL); |
1549 | } | |
1550 | ||
1551 | /* | |
0597c49c | 1552 | * local trace_kprobes are not added to dyn_event, so they are never |
33ea4b24 SL |
1553 | * searched in find_trace_kprobe(). Therefore, there is no concern of |
1554 | * duplicated name "DUMMY_EVENT" here. | |
1555 | */ | |
1556 | tu = alloc_trace_uprobe(UPROBE_EVENT_SYSTEM, "DUMMY_EVENT", 0, | |
1557 | is_return); | |
1558 | ||
1559 | if (IS_ERR(tu)) { | |
1560 | pr_info("Failed to allocate trace_uprobe.(%d)\n", | |
1561 | (int)PTR_ERR(tu)); | |
0c92c7a3 | 1562 | path_put(&path); |
33ea4b24 SL |
1563 | return ERR_CAST(tu); |
1564 | } | |
1565 | ||
1566 | tu->offset = offs; | |
0c92c7a3 | 1567 | tu->path = path; |
a6ca88b2 | 1568 | tu->ref_ctr_offset = ref_ctr_offset; |
33ea4b24 | 1569 | tu->filename = kstrdup(name, GFP_KERNEL); |
e3dc9f89 | 1570 | init_trace_event_call(tu); |
33ea4b24 | 1571 | |
0a46c854 | 1572 | if (traceprobe_set_print_fmt(&tu->tp, is_ret_probe(tu)) < 0) { |
33ea4b24 SL |
1573 | ret = -ENOMEM; |
1574 | goto error; | |
1575 | } | |
1576 | ||
e3dc9f89 | 1577 | return trace_probe_event_call(&tu->tp); |
33ea4b24 SL |
1578 | error: |
1579 | free_trace_uprobe(tu); | |
1580 | return ERR_PTR(ret); | |
1581 | } | |
1582 | ||
1583 | void destroy_local_trace_uprobe(struct trace_event_call *event_call) | |
1584 | { | |
1585 | struct trace_uprobe *tu; | |
1586 | ||
60d53e2c | 1587 | tu = trace_uprobe_primary_from_call(event_call); |
33ea4b24 | 1588 | |
33ea4b24 SL |
1589 | free_trace_uprobe(tu); |
1590 | } | |
1591 | #endif /* CONFIG_PERF_EVENTS */ | |
1592 | ||
f3f096cf SD |
1593 | /* Make a trace interface for controling probe points */ |
1594 | static __init int init_uprobe_trace(void) | |
1595 | { | |
1596 | struct dentry *d_tracer; | |
0597c49c MH |
1597 | int ret; |
1598 | ||
1599 | ret = dyn_event_register(&trace_uprobe_ops); | |
1600 | if (ret) | |
1601 | return ret; | |
f3f096cf SD |
1602 | |
1603 | d_tracer = tracing_init_dentry(); | |
14a5ae40 | 1604 | if (IS_ERR(d_tracer)) |
f3f096cf SD |
1605 | return 0; |
1606 | ||
1607 | trace_create_file("uprobe_events", 0644, d_tracer, | |
1608 | NULL, &uprobe_events_ops); | |
1609 | /* Profile interface */ | |
1610 | trace_create_file("uprobe_profile", 0444, d_tracer, | |
1611 | NULL, &uprobe_profile_ops); | |
1612 | return 0; | |
1613 | } | |
1614 | ||
1615 | fs_initcall(init_uprobe_trace); |